Looking for a baby girl that name goes well with [name_m]Robert[/name_m] [name_m]Peter[/name_m] and [name_u]Harry[/name_u] [name_m]Nicholas[/name_m].
What are your thoughts on [name_f]Cecilia[/name_f] or [name_f]Charlotte[/name_f]? Any suggestions are welcome.
I’m a [name_f]Charlotte[/name_f] so that gets my vote 
I really love [name_f]Cecily[/name_f] over [name_f]Cecelia[/name_f]
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I personally adore [name_f]Cecilia[/name_f] and I think it goes well with [name_m]Robert[/name_m] and [name_u]Harry[/name_u]. I think [name_f]Charlotte[/name_f] is an amazing name but perhaps a bit too royal-sounding with the other names. [name_f]Cecilia[/name_f] gets my vote!
I’d suggest:
[name_f]Eleanor[/name_f]
[name_f]Cordelia[/name_f]
[name_f]Clara[/name_f]
[name_f]Matilda[/name_f]
[name_f]Adelaide[/name_f]
[name_f]Genevieve[/name_f]
[name_f]Guinevere[/name_f]
[name_f]Edith[/name_f]
[name_f]Eve[/name_f]
[name_f]Pearl[/name_f]
[name_f]Iris[/name_f]
Individually I prefer [name_f]Cecilia[/name_f], but with your kids, [name_f]Charlotte[/name_f] is definitely the better match. I like [name_f]Lottie[/name_f] as a nickname too with [name_m]Peter[/name_m] and [name_u]Harry[/name_u], if you nicknames are your thing!
Mary
[name_f]Sarah[/name_f]
[name_f]Catherine[/name_f]
[name_f]Laura[/name_f]
[name_u]Anne[/name_u]
[name_f]Rachel[/name_f]
[name_f]Margaret[/name_f]
[name_f]Isabel[/name_f]/la
[name_f]Alice[/name_f]
[name_f]Daisy[/name_f]
[name_f]Nancy[/name_f]
[name_f]Elizabeth[/name_f]
I love [name_f]Charlotte[/name_f]! She’d make a great sister to [name_m]Peter[/name_m] and [name_u]Harry[/name_u]
Charlotte and [name_f]Cecilia[/name_f] are wonderful options. I’d go with [name_f]Charlotte[/name_f] if you want something more familiar and [name_f]Cecilia[/name_f] if you want something more distinct.
Beatrice, [name_f]Alice[/name_f], [name_f]Celia[/name_f], [name_f]Imogen[/name_f], [name_f]Kate[/name_f] and [name_f]Lydia[/name_f] came to mind
[name_m]Hi[/name_m] there.
[name_f]Charlotte[/name_f] is nice, but very over done. Plus, [name_f]Charlotte[/name_f] & [name_u]Harry[/name_u] may be a little royal sounding. [name_f]Cecilia[/name_f] is gorgeous, & perfect w/your crew. It’s smart, feminine, classic & grows up well. It’s oddly popular in my area, but I don’t think so in general.
A few more ideas-
[name_f]Alice[/name_f]
[name_f]Audrey[/name_f]
[name_f]Annabelle[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Cecily[/name_f]
[name_f]Clara[/name_f]
[name_f]Clementine[/name_f]
[name_f]Catherine[/name_f]
[name_f]Daisy[/name_f]
[name_f]Delia[/name_f]
[name_f]Emmeline[/name_f]
[name_f]Eloise[/name_f]
[name_f]Emily[/name_f]
[name_f]Flora[/name_f]
[name_f]Frances[/name_f]
[name_f]Georgia[/name_f]
[name_f]Imogen[/name_f]
[name_u]June[/name_u]
[name_f]Jane[/name_f]
[name_f]Josephine[/name_f]
[name_u]Louise[/name_u]
[name_f]Louisa[/name_f]
[name_f]Lucy[/name_f]
[name_f]Lucille[/name_f]
[name_f]May[/name_f]
[name_f]Mabel[/name_f]
[name_f]Margaret[/name_f]
[name_f]Matilda[/name_f]
[name_f]Millicent[/name_f]
[name_f]Nora[/name_f]
[name_f]Olive[/name_f]
[name_f]Oliva[/name_f]
[name_f]Pearl[/name_f]
[name_f]Rose[/name_f]
[name_u]Ruby[/name_u]
[name_f]Rosalie[/name_f]
[name_f]Sally[/name_f]
[name_f]Thea[/name_f]
[name_f]Violet[/name_f]
[name_f]Willa[/name_f]
[name_f]Hope[/name_f] this helps. 
To match the classic style of your boy names the first girl name I thought would fit was [name_f]Claire[/name_f] or [name_f]Clara[/name_f].
Others that would be adorable:
[name_f]Helen[/name_f]
[name_f]Ada[/name_f]
[name_f]Matilda[/name_f]
[name_f]Hazel[/name_f]
[name_f]Rosemary[/name_f]
[name_f]Lillian[/name_f]
[name_f]Nora[/name_f]
[name_f]Juliet[/name_f]
[name_f]Victoria[/name_f]
[name_f]Emmeline[/name_f]
[name_f]Alice[/name_f]
[name_f]Catherine[/name_f]
[name_f]Laurel[/name_f]
[name_f]Lydia[/name_f]
[name_f]Eva[/name_f]
[name_f]Amelia[/name_f]
I agree with @MichelleM! [name_f]Charlotte[/name_f] feels a bit expected, but [name_f]Cecilia[/name_f] is lovely.
I like [name_f]Charlotte[/name_f]! It goes well with the other names! Some other options:
[name_f]Mary[/name_f]
[name_f]Grace[/name_f]
[name_f]Sandra[/name_f]
[name_f]Emily[/name_f]
[name_f]Maya[/name_f]
[name_u]Evelyn[/name_u]
[name_f]Edith[/name_f]
[name_f]Sarah[/name_f]
[name_f]Michelle[/name_f]
[name_f]Rosie[/name_f]
[name_f]Mae[/name_f]
[name_f]Julia[/name_f]
[name_u]Marie[/name_u]
What about [name_m]Robert[/name_m] [name_m]Peter[/name_m], [name_u]Harry[/name_u] [name_m]Nicholas[/name_m], and…
Elizabeth [name_f]Grace[/name_f]
[name_f]Penelope[/name_f] [name_f]Clara[/name_f]
[name_f]Jane[/name_f] [name_f]Clara[/name_f]
[name_f]Olivia[/name_f] [name_f]Lily[/name_f]
[name_f]Caroline[/name_f] [name_f]Scarlett[/name_f]
[name_f]Beatrice[/name_f] [name_u]Harper[/name_u]
[name_f]Genevieve[/name_f] [name_f]Rachel[/name_f]
[name_f]Alice[/name_f] [name_f]Nancy[/name_f]
[name_f]Nora[/name_f] [name_f]Beatrix[/name_f]
LMK what you think!!
Charlotte [name_f]Willa[/name_f]
[name_f]Claire[/name_f] [name_f]Wilhelmina[/name_f]
[name_f]Clara[/name_f] [name_f]Wilhelmina[/name_f]
I love [name_f]Charlotte[/name_f]. It’s beautiful, classy, and gives great nickname options.
Peter, [name_u]Harry[/name_u] and [name_f]Ivy[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Estelle[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Elise[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Fiona[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Emilia[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Florence[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Celeste[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_f]Rosalie[/name_f]
[name_m]Peter[/name_m], [name_u]Harry[/name_u] and [name_u]Evelyn[/name_u]
x
I say go with [name_f]Cecilia[/name_f] [name_f]Charlotte[/name_f] that way you get [name_f]Cece[/name_f] or Cetty
I love both [name_f]Cecilia[/name_f] and [name_f]Charlotte[/name_f]! [name_m]Can[/name_m]’t go wrong with either 
Greyblue said it all!
[name_f]Charlotte[/name_f] is sweet, popular and timeless. [name_f]Cecilia[/name_f] is elegant and traditional but also unexpected. I believe most people would be surprised with this lovely choice (in a positive way).
Both names are really stunning! Perhaps you would consider [name_f]Cecilia[/name_f] [name_f]Charlotte[/name_f] or [name_f]Charlotte[/name_f] [name_f]Cecilia[/name_f]?
Cecilia is very pretty and though I do not like it as much as [name_f]Charlotte[/name_f], [name_f]Charlotte[/name_f] in my opinion is very popular nowadays. So I vote [name_f]Cecilia[/name_f], though I do love [name_f]Charlotte[/name_f]. I also thought of [name_f]Caroline[/name_f], [name_f]Claire[/name_f] and [name_f]Clara[/name_f]. Good luck!